diff --git a/lib/quickpay/api/client.rb b/lib/quickpay/api/client.rb
index 5495309..ae95ddc 100644
--- a/lib/quickpay/api/client.rb
+++ b/lib/quickpay/api/client.rb
@@ -67,6 +67,7 @@ def initialize(username: nil, password: nil, base_uri: "https://api.quickpay.net
           net_req.body = req.body
           res = Net::HTTP.start(
             uri.hostname,
+            uri.port,
             use_ssl: uri.scheme == HTTPS,
             open_timeout: @connect_timeout,
             read_timeout: @read_timeout,
diff --git a/lib/quickpay/api/version.rb b/lib/quickpay/api/version.rb
index 465a761..b970388 100644
--- a/lib/quickpay/api/version.rb
+++ b/lib/quickpay/api/version.rb
@@ -1,5 +1,5 @@
 module QuickPay
   module API
-    VERSION = "4.0.0".freeze
+    VERSION = "4.0.1".freeze
   end
 end
diff --git a/test/client.rb b/test/client.rb
index a932fd8..4decd7f 100644
--- a/test/client.rb
+++ b/test/client.rb
@@ -18,22 +18,14 @@
     stub_request(:any, //).to_return(body: "Unknown Stub", status: 500)
   end
 
-  it "set default headers" do
-    stub_request(:get, %r{/ping}).to_return { |request| { headers: request.headers, status: 200 } }
+  it "does not smoke" do
+    stub_request(:get, "http://localhost:4242/ping").to_return { |request| { headers: request.headers, status: 200 } }
 
-    client = QuickPay::API::Client.new
+    client = QuickPay::API::Client.new(password: "secret", base_uri: "http://localhost:4242")
     _, _, headers = *client.get("/ping")
 
     _(headers["accept-version"]).must_equal "v10"
     _(headers["user-agent"]).must_equal "quickpay-ruby-client, v#{QuickPay::API::VERSION}"
-  end
-
-  it "handles authentication" do
-    stub_request(:get, %r{/ping}).to_return { |request| { headers: request.headers, status: 200 } }
-
-    client = QuickPay::API::Client.new(password: "secret")
-    _, _, headers = *client.get("/ping")
-
     _(headers["authorization"]).must_equal "Basic OnNlY3JldA=="
   end
 
@@ -184,7 +176,7 @@
       _(e.request.body).must_equal "foo=bar&baz=qux"
       _(e.request.headers["Accept-Version"]).must_equal "v10"
       _(e.request.headers["User-Agent"]).must_equal "quickpay-ruby-client, v#{QuickPay::API::VERSION}"
-      _(e.request.query).must_equal(nil)
+      _(e.request.query).must_be_nil
 
       e = assert_raises QuickPay::API::Error do
         stub_request(:post, %r{/upload}).to_return(status: 409, body: "Conflict", headers: { "Foo" => "bar" })